html,body{
	display: flex;
	flex-direction: column;
	height: 100vh;
	width:100vw;
	overflow-x: hidden;
}
#main_footer,footer{
	border:1px solid #ccc;
}

#main_header{
	background-color:#FF8C00;
	height: 30px;
	top:0px;
	width:100vw;
	position:absolute;
	top:0;
}

footer{
	height: 30px;
	background-color:#FF8C00;
	width:100vw;
	position:absolute;
	bottom:0;
}
article{
	flex-grow: 1;
	display: flex;
	flex-direction: row;
	width:80vw;
	margin:0px auto;
}
#main_menu{
	margin:35px auto 0 auto;
	height: 30px;
	width:80vw;
}
#menu_ul{
	margin:0px auto;
}
.menu_level1_li{
	float:left;
	width:80px;
	text-align: center;
	border-right:1px solid crimson;
	border-collapse: collapse;
}
.menu_level1_li:first-of-type{
		border-left:1px solid crimson;
}
ul{
	padding: 0px;
	margin:0px;
}
ul li{
	list-style: none;
}
ul a:link,ul a:hover,ul a:active,ul a:visited{
	text-decoration: none;
	color:black;
	cursor:pointer;
}